Easy: a Roomba that does not smear pet feces. I would happily spend double the amount of todays best Roomba if they could invent one that would simply stop whe

Easy: a Roomba that does not smear pet feces. I would happily spend double the amount of todays best Roomba if they could invent one that would simply stop when it found pet poop. After breaking 3 robots over my knee for covering my floor in pet poo, I decided to simply not vacuum. :D